Process for manufacturing steel.



, UNITED STATES PATENT OFFICE.

HENRI DELPORTE, FILS, or OUGREE, iSELGIUMQASSIGNOR To ElSEN-UND STAHLWERK HOESCH, AK'JIENGESELLSCHAFT, OF nonruunn, GERMANY.

PROCESS FOR MANUFACTURiNG STEEL.

Specification of Letters Patent.

Patented Jui so, 19o7.

Application fil d January 2, 1906-- Serial No. 294 829.

- a specification.

According to this invention the process of refining iron in a Siemens-Martin furnace is conducted in two or more stages for facilitating the refining. The forpace first receives the ore and limestone or lime or other material to-aid the refining, and is then charged with pig iron and scrap, or with pig iron alone in solid or liquid state, but preferably liquid. During the process more refining materials are added if necessary.

When by the reaction of the materialspresent the greaterpart of certain of the impurities in the iron, -'irticnlarly silicon, phosphorus and sulfur have been removed, the partly refined metal is withdrawn as by being tapped into a ladle and the slags are run out of the-furnace. Then the furnace is again charged with ore and limestone or lime or other additions according to the requirements, and the liquid metal in the ladle is vpoured back into the furnace. In -this second stage of the process, metal already highly refined; comes in contact with fresh refining material in a furnace free from slag, and the 'action of such material is rapid and thorinigh. The impurities and particularly phrkrphorus are in this manner easily removed.- It is obvious [Eli-at the withdrawal of the metal and its reintroduction into the cleaned-furnace may be repeatedas often as is advantageous.

What I claim is, The process substantially as hereinbefore set forth of refining pig iron in a single. furnace, WlllCllCOflSlStS in charging the furnace with the ore and refining material, withdrawing the partially refined metal from the furnace, removlng the slug therefrom, recharging the furnace, and

returning the partlal'l-y refined metal to the samefurnace.

whereby the partially refined metal comes in contact with fresh refining material free from slag.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

' n; nnnrorrrn, Fins; Witnesses Mmzcnn Ree m2, VA. Scrnun. 

